SI8271AB-ISR

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Isolators-Gate Drivers are electronic devices, which are used to drive the turn on and turn off of a device that is electrically isolated from its control circuits. A common example is the gate driver for power MOSFETs or IGBTs. The SI8271AB-ISR is a high current power gate driver that is used to drive high voltage power semiconductor devices like IGBTs and MOSFETs. It features low RDS-ON loss through a high-side output and adjustable deadtime to reduce losses due to shoot-through.

The SI8271AB-ISR gate driver has a wide variety of applications in different fields. One such application is in power conversion products like AC-AC converters, UPS systems, LED lighting, Solar inverters, Automotive and Electric vehicle products. It is also used in motor controls and power supplies, where quick switching and high-current drive signals are needed. This gate driver is also suitable for use in PFC (Power Factor Corrector) applications due to its low-side current-sense and overload protection.

The SI8271AB-ISR is a two-channel, high-side and low-side, dual gate driver that is equipped with a high-side low-side synchronous driver circuit. It has a high accuracy adjustable dead time that helps reduce loss due to shoot-through. It also has an adjustable ruggedized current limit functionality, which is useful in applications where wide voltage swings are encountered. Additionally, the device features soft-start and under voltage lockout with a built-in 25 kHz oscillator.

The working principle of the SI8271AB-ISR is based on the concept of using an optically isolated signal level to drive a power device. The device operates in a bridge configuration, with the high-side and low-side drivers providing the necessary control signals. The signal generated by the driver circuit is then used to switch the power device, either on or off. The two channels in the device can be used to switch power devices of both polarities.

The SI8271AB-ISR gate driver is designed to operate with voltage inputs ranging from 4.5V to 18V and can drive high side outputs with a voltage of up to 400V. It also allows protection against short-circuit, overload, and current limiter malfunction. These features make the SI8271AB-ISR an ideal choice for applications where high currents, higher voltage requirements, and reliable protection are present.

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